
Gabrielle M. answered 04/02/19
French Native from Paris with Teaching Experience
That's a very good question. The only difference is the way you would put a breath/break between words when you pronounced them outloud.
Thus, the first one would read " quatre-vingt-seize, soixante-seize, soixante-quinze, quatre-vingt-dix-neuf"
whereas the second one would read "quatre-vingt, seize, soixante, seize, soizante, quinze, quatre-vingt, dix-neuf".